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The Q'Fusor Sound Diffusor is a design derived by combining a standard quadratic residue sequence with other mathematical techniques, creating a profile that optimizes scattering surfaces. Combine this with an overall depth of approximately three inches, and you have superior diffusion down to a frequency of around 800Hz. Sonically, this means more accurate control of sound reflections in your room without making the room sound flat. The Q'Fusor is a great step up from Auralex's very effective MetroFusor and, like all of their diffusors, is extremely affordable and easy to install.